Europa & Io moons orbiting Jupiter, captured by the Cassini space probe _ Europa and Io are two of Jupiter’s largest moons and are relatively close to each other compared to their distance from Jupiter. The average distance between Europa and Io is approximately 306,000 kilometers (190,000 miles). Both moons orbit Jupiter in nearly circular paths, but their orbital periods are different. Europa takes about 3.5 Earth days to complete one orbit around Jupiter, while Io’s orbital period is approxim